将条目保存到postgres DB时遇到一些问题。我正在使用hibernate和spring但是我无法为此目的使用DAO类。相反,以下代码适用于我:
Session session = sessionFactory.openSession();
Transaction tx = null;
Blob blob = null;
try {
tx = session.beginTransaction();
VoiceMail message02 = new VoiceMail(44, 1, "dir/msgs",
"dummy_data", "dummy_data", "6003", "19/01/2015",
"1:35", "flag", "dummy_data", "dummy_data", blob,
"label", false, "1");
//voiceMailDao.save(message02);
session.save(message02);
tx.commit();
} catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
当我尝试评论该行时
session.save(message02);
并离开
行voiceMailDao.save(message02);
它不起作用。生成以下输出:
save is not valid without active transaction
at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)
at com.sun.proxy.$Proxy750.save(Unknown Source)
at com.musala.ving.daoimpl.VoiceMailDaoImpl.save(VoiceMailDaoImpl.java:17)
at com.musala.ving.controllers.VoiceMailController.list(VoiceMailController.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
很抱歉这篇文章很长,但我在这里阅读了有关此问题的所有主题,但我仍然无法理解。
我的DAO课程如下:
public class VoiceMailDaoImpl implements VoiceMailDao{
@Autowired
private SessionFactory sessionFactory;
public void save(VoiceMail voicemail) {
this.sessionFactory.getCurrentSession().save(voicemail);
}
public void update(VoiceMail voicemail) {
this.sessionFactory.getCurrentSession().update(voicemail);
}
public void delete(VoiceMail voicemail) {
this.sessionFactory.getCurrentSession().delete(voicemail);
}
}
感谢任何帮助!
谢谢!
答案 0 :(得分:0)
你能使用注释吗?
它更简单,只需使用Transactional注释你的dao类。
@Transactional
然后所有方法都是自动事务性的,如果你只想要特定的方法,你也可以只为方法自己添加相同的注释。它需要处理事务处理的麻烦。
有关如何实现此目标的详细示例,请参阅this link。
----编辑----
此外,如果您对项目有所了解,请查看spring-boot,它将大大加快您的系统开发速度。 Spring - Boot。 该项目有助于为您的系统设置一些最佳实践,让您的工作速度更快。我们目前正在新项目中使用它,它可以非常快速地建立新项目。